Actor Sam Page has revealed that his second episode of Mad Men contained the toughest scene to film.

Page joined the show in its second season as young doctor Greg Harris, who later sexually assaulted Joan Holloway (Christina Hendricks).

He told the AMC blog: "I didn't know that was coming up when I was cast. And then the next episode, as they were bringing me back, I ended up running into [writer] Robin Veith out somewhere, and she told me not to be upset about 'what we make you do', and I said, 'Okay, I'm just happy to be back'.

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"I looked at a script and was paging through it, and my jaw hit the floor. It was not what I expected to be coming."

Page praised co-star Hendricks for making the scene less awkward.

"Christina was so generous with the off-camera preparation and she couldn't have been more helpful and understanding." he said. "For me, it was my second day on set on a show I'm a huge fan of, so she made it incredibly easy."

Page also recently appeared in a multi-episode arc on Desperate Housewives.